The head of the United Nations nuclear watchdog agency has said for the first time that a target bombed in Syria in 2007 was a secretly built nuclear reactor.

Yukiya Amano Thursday told a Paris press conference that the facility destroyed by Israel in an air strike was a "nuclear reactor under construction." As such, Amano said, it was not producing plutonium.

IAEA Confirms Syria Secretly Building Nuclear Reactor

Amano said the reactor was "allegedly" destroyed in the air strike.

IAEA Confirms Syria Secretly Building Nuclear Reactor

Syria has long denied the facility was related to nuclear activities. According to a March 7 statement by Amano to the IAEA, Syria has not cooperated with the watchdog agency since June 2008 to address issues related to the site.

IAEA Confirms Syria Secretly Building Nuclear Reactor

The conference otherwise largely focused on nuclear safety and disaster at Japan's Fukushima Daichi nuclear reactor, heavily damaged by the March 11 earthquake and tsunami.